//
//  DiscountAllocationViewModel.swift
//  Storefront
//
//  Created by Shopify.
//  Copyright (c) 2017 Shopify Inc. All rights reserved.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

import Foundation
import Buy

final class DiscountAllocationViewModel: ViewModel {
    
    typealias ModelType = Storefront.DiscountAllocation
    
    let model: ModelType
    
    let amount:       Decimal
    let currencyCode: String
    let application:  DiscountApplication
    
    // ----------------------------------
    //  MARK: - Init -
    //
    required init(from model: ModelType) {
        self.model        = model
        
        self.amount       = model.allocatedAmount.amount
        self.currencyCode = model.allocatedAmount.currencyCode.rawValue
        self.application  = model.discountApplication.resolvedViewModel
    }
}

extension Storefront.DiscountAllocation: ViewModeling {
    typealias ViewModelType = DiscountAllocationViewModel
}

extension Array where Element == DiscountAllocationViewModel {
    
    var aggregateName: String {
        return self.map {
            $0.application.name
        }.joined(separator: ", ")
    }
    
    var totalDiscount: Decimal {
        return reduce(0) {
            $0 + $1.amount
        }
    }
}
